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Rise in temperatures and CO2 follow each other closely in climate change

Date:

July 23, 2012

Source:

University of Copenhagen

Summary:

The greatest climate change the world has seen in the last 100,000 years was the transition from the ice age to the warm interglacial period. New research indicates that, contrary to previous opinion, the rise in temperature and the rise in the atmospheric carbon dioxide follow each other closely in terms of time.

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The research results show that the concentration of CO2 in the atmosphere followed the temperature in Antarctica closely throughout the shift from ice age to interglacial in the period 19-11,000 years before the present. The green curve shows the temperature from measurements from the 5 ice cores marked on the map. The red and blue curves show the atmospheric CO2 content in the air bubbles in the ice cores from the two bores at Siple Dome (red) and Byrd (blue). The analysis shows that the CO2 concentration follows the increase in temperature with a delay of no more than a few hundred years. That the CO2 concentration in the atmosphere follows the Antarctic tempera- ture so closely suggests that processes in the ocean around Antarctica play an important role in the rise in CO2.

Credit: Image courtesy of University of Copenhagen

The greatest climate change the world has seen in the last 100,000 years was the transition from the ice age to the warm interglacial period. New research from the Niels Bohr Institute at the University of Copenhagen indicates that, contrary to previous opinion, the rise in temperature and the rise in the atmospheric CO2 follow each other closely in terms of time. The results have been published in the scientific journal, Climate of the Past.

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In the warmer climate the atmospheric content of CO2 is naturally higher. The gas CO2 (carbon dioxide) is a green-house gas that absorbs heat radiation from Earth and thus keeps Earth warm. In the shift between ice ages and interglacial periods the atmospheric content of CO2 helps to intensify the natural climate variations.

It had previously been thought that as the temperature began to rise at the end of the ice age approximately 19,000 years ago, an increase in the amount of CO2 in the atmosphere followed with a delay of up to 1,000 years.

"Our analyses of ice cores from the ice sheet in Antarctica shows that the concentration of CO2 in the atmosphere follows the rise in Antarctic temperatures very closely and is staggered by a few hundred years at most," explains Sune Olander Rasmussen, Associate Professor and centre coordinator at the Centre for Ice and Climate at the Niels Bohr Institute at the University of Copenhagen.

Deep-sea's important role

The research, which was carried out in collaboration with researchers from the University of Tasmania in Australia, is based on measurements of ice cores from five boreholes through the ice sheet in Antarctica. The ice sheet is formed by snow that doesn't melt, but remains year after year and is gradually compressed into kilometers thick ice. During the compression, air is trapped between the snowflakes and as a result the ice contains tiny samples of ancient atmospheres. The composition of the ice also shows what the temperature was when the snow fell, so the ice is an archive of past climate and atmospheric composition.

"The ice cores show a nearly synchronous relationship between the temperature in Antarctica and the atmospheric content of CO2, and this suggests that it is the processes in the deep-sea around Antarctica that play an important role in the CO2 increase," explains Sune Olander Rasmussen.

He explains that one of the theories is that when Antarctica warms up, there will be stronger winds over the Southern Ocean and the winds pump more water up from the deep bottom layers in the ocean where there is a high content of CO2 from all of the small organisms that die and fall down to the sea floor and rot. When strong winds blow over the Southern Ocean, the ocean circulation brings more of the CO2-rich bottom water up to the surface and a portion of this CO2 is released into the atmosphere. This process links temperature and CO2 together and the new results suggest that the linking is closer and happens faster than previously believed.

Climatic impact

The global temperature changed naturally because of the changing solar radiation caused by variations in Earth's orbit around the Sun, Earth's tilt and the orientation of Earth's axis. These are called the Milankowitch cycles and occur in periods of approximately 100,000, 42,000, and 22,000 years. These are the cycles that cause Earth's climate to shift between long ice ages of approximately 100,000 years and warm interglacial periods, typically 10,000 -- 15,000 years. The natural warming of the climate was intensified by the increased amount of CO2 in the atmosphere.

"What we are observing in the present day is the mankind has caused the CO2 content in the atmosphere to rise as much in just 150 years as it rose over 8,000 years during the transition from the last ice age to the current interglacial period and that can bring the Earth's climate out of balance," explains Sune Olander Rasmussen, adding: "That is why it is even more important that we have a good grip on which processes caused the climate of the past to change, because the same processes may operate in addition to the anthropogenic changes we see today. In this way the climate of the past helps us to understand how the various parts of the climate systems interact and what we can expect in the future."

University of Copenhagen. "Rise in temperatures and CO2 follow each other closely in climate change." ScienceDaily. ScienceDaily, 23 July 2012. <www.sciencedaily.com/releases/2012/07/120723162707.htm>.

University of Copenhagen. (2012, July 23). Rise in temperatures and CO2 follow each other closely in climate change. ScienceDaily. Retrieved March 3, 2015 from www.sciencedaily.com/releases/2012/07/120723162707.htm

University of Copenhagen. "Rise in temperatures and CO2 follow each other closely in climate change." ScienceDaily. www.sciencedaily.com/releases/2012/07/120723162707.htm (accessed March 3, 2015).

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